This is a note to let you know that I've just added the patch titled isofs: Refuse RW mount of the filesystem instead of making it RO to the 3.0-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: isofs-refuse-rw-mount-of-the-filesystem-instead-of-making-it-ro.patch and it can be found in the queue-3.0 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 17b7f7cf58926844e1dd40f5eb5348d481deca6a Mon Sep 17 00:00:00 2001 From: Jan Kara <jack@xxxxxxx> Date: Thu, 25 Jul 2013 11:49:11 +0200 Subject: isofs: Refuse RW mount of the filesystem instead of making it RO From: Jan Kara <jack@xxxxxxx> commit 17b7f7cf58926844e1dd40f5eb5348d481deca6a upstream. Refuse RW mount of isofs filesystem. So far we just silently changed it to RO mount but when the media is writeable, block layer won't notice this change and thus will think device is used RW and will block eject button of the drive. That is unexpected by users because for non-writeable media eject button works just fine. Userspace mount(8) command handles this just fine and retries mounting with MS_RDONLY set so userspace shouldn't see any regression. Plus any tool mounting isofs is likely confronted with the case of read-only media where block layer already refuses to mount the filesystem without MS_RDONLY set so our behavior shouldn't be anything new for it. Reported-by: Hui Wang <hui.wang@xxxxxxxxxxxxx> Signed-off-by: Jan Kara <jack@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/isofs/inode.c | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-) --- a/fs/isofs/inode.c +++ b/fs/isofs/inode.c @@ -119,8 +119,8 @@ static void destroy_inodecache(void) static int isofs_remount(struct super_block *sb, int *flags, char *data) { - /* we probably want a lot more here */ - *flags |= MS_RDONLY; + if (!(*flags & MS_RDONLY)) + return -EROFS; return 0; } @@ -769,15 +769,6 @@ root_found: */ s->s_maxbytes = 0x80000000000LL; - /* - * The CDROM is read-only, has no nodes (devices) on it, and since - * all of the files appear to be owned by root, we really do not want - * to allow suid. (suid or devices will not show up unless we have - * Rock Ridge extensions) - */ - - s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */; - /* Set this for reference. Its not currently used except on write which we don't have .. */ @@ -1528,6 +1519,9 @@ struct inode *isofs_iget(struct super_bl static struct dentry *isofs_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) { + /* We don't support read-write mounts */ + if (!(flags & MS_RDONLY)) + return ERR_PTR(-EACCES); return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super); } Patches currently in stable-queue which might be from jack@xxxxxxx are queue-3.0/isofs-refuse-rw-mount-of-the-filesystem-instead-of-making-it-ro.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html